To assess whether Mrs. Webster had suffered from a brain injury, researchers conditioned her to blink in response to a sound that signaled the delivery of a puff of air directed toward her face. In this application of classical conditioning, the sound was a

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In classical conditioning, the conditioned stimulus (CS) is the initially neutral stimulus that comes to elicit a conditioned response (CR) after being paired with an unconditioned stimulus (US) that naturally elicits an unconditioned response (UR). Here, the sound was initially a neutral stimulus, but after being paired with the puff of air that naturally elicits a blink (UR), it came to elicit a conditioned response (blinking) when presented alone (CR). Therefore, the sound is the CS.

To Assess Whether Mrs